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Unfun fact: the most fortified border of a European country is actually in Africa, in the Spanish colonial city of Melilla
(hexbear.net)
Two layers of electrified, barbed wire, with armed guards to keep a colony secure. Colonialism has never actually ended
Because they are completely different issues. Melilla and Ceuta have been spanish for 500 years and are normal cities.
Meanwhile Gibraltar is a tax haven, a resort for old brits and a tool used by Great Britain to dominate the Mediterranean sea.